'In Nigeria, cylinders are owned by individuals but owned by marketers in other climes and once the cylinders are due for recertification, it is easy for withdrawal, but difficult to get these cylinders from individuals to do requalification.
Na Naịjirịa, ọ bụ ndị mmadụ n'otu n'out new silinda mana ndị na-ere ahịa n'oge ọzọ maka inye aka, ọ dị mfe ịdọrọ ya, mana ọ ga - esi ike inweta silinda ndị a ka ndị mmadụ mee nyocha.